I have quite a large collection of Hornsea Heirloom pottery in both brown and green and I too have a lovely coffee pot like the one on your webpage -
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www.retrowow.co.uk]
I have been collecting this pottery for a couple of years now and find the best place to find it is in charity shops. I was very lucky and found six cereal bowls in a wonderful charity shop in Newent and they were very reasonably priced (and no chips), so I had to have them.
My sister-in-law did even better and got a full dinner set from her local charity shop in Warwick for about ten pounds - wish I had seen it first!
I use my Hornsea Heirloom pottery on a daily basis, so I have a touch of retro in my life every day!